Modification is performed to allow a gamer to play a game different from its original released version. It is generally performed by end users or developers, and the modded version is considered as an unofficial version of the game.

Typically, when a modification is applied to a game, the user or gamer can have better weapons, more game money, different background textures, stronger character health and any other characteristics specific to a game.

Modification can be partial or total, or it may be used only to fix some bugs.